Try TSO offload on Guest Virtio interface And try passthrough interface mode at Host Level for this Guest Virtio Interface Thanks, Venkatesh -----Original Message----- From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On Behalf Of JR Sent: Wednesday, May 14, 2014 9:07 PM To: kvm@xxxxxxxxxxxxxxx Subject: Poor performance with virtio network driver on windows 2008 R2 on KVM Greetings all, Though I don't believe that this is KVM problem per se, I'm seeing very poor network performance when using windows 2008R2 KVM instances with the virtio driver when on a 10G network. iperf results show linux VMs getting close to wire speeds, while windows only does about 1.3Gb/sec. I've tried a number of tcp settings (chimney, etc...) as recommended by some google searches but nothing has helped. Does anyone have any advice? Thanks much, JR -- Your electronic communications are being monitored; strong encryption is an answer. My public key <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
